CN117214042A - Paint edge covering force and thick film crack resistance testing device and testing method - Google Patents
Paint edge covering force and thick film crack resistance testing device and testing method Download PDFInfo
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- CN117214042A CN117214042A CN202311334454.8A CN202311334454A CN117214042A CN 117214042 A CN117214042 A CN 117214042A CN 202311334454 A CN202311334454 A CN 202311334454A CN 117214042 A CN117214042 A CN 117214042A
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- 238000012360 testing method Methods 0.000 title claims abstract description 81
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
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- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
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- 229910001256 stainless steel alloy Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
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- 239000011521 glass Substances 0.000 claims description 2
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- 238000002156 mixing Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 5
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000002932 luster Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
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- 239000011527 polyurethane coating Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 125000001931 aliphatic group Chemical group 0.000 description 1
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Abstract
The invention belongs to the technical field of coating detection, and particularly discloses a coating edge covering force and thick film crack resistance testing device and a testing method, wherein the testing device comprises a tray, the tray is circular, a cone is arranged on the tray, and the top of the cone is a plane; be equipped with a plurality of conical surfaces on the cone, a plurality of the area size of conical surface equals, and is adjacent contained angle between the conical surface equals, the conical surface expands from top to bottom, is equipped with the tooth between the adjacent two the conical surface, and a plurality of the tooth height of tooth equals, the tooth is equipped with the flank, the angle of flank and conical surface is alpha, alpha = 90 ~ 150, the tooth is equipped with the flank, the angle beta of flank and flank, beta = alpha-360/tooth number 2, the flank is equipped with the chamfer with the crossing department of flank, the chamfer is 0.5 ~ 3mm. The testing device, the testing method and the evaluating method have the characteristics of easy implementation and strong operability, and realize the detection and evaluation of the edge covering power and the thick film cracking resistance of the coating.
Description
Technical Field
The invention relates to the technical field of coating detection, in particular to a device and a method for testing coating edge covering force and thick film crack resistance.
Background
The anti-corrosion coating is an isolation layer which is coated on the surface of the metal and is isolated from surrounding media, thereby playing a role in corrosion prevention. In general, a film forming process of a coating, i.e., a coating is applied to a substrate surface, and then a continuous and uniform protective layer is formed through processes of wetting, leveling, solvent evaporation, drying, and the like.
In practical construction and application, in the leveling process of the coating, the corner shrinkage effect exists at special structural parts such as corners or welding seams, so that the dry film thickness at the corners is insufficient, and the corrosion resistance of the area is low, so that corrosion occurs at the corners or welding seams at first, and the overall sensory quality and the corrosion resistance of the corrosion-resistant coating are seriously affected. Aiming at the problems, the main treatment method at present is to add a diluent to increase the fluidity of the paint or precoat corners and weld joints before formal painting, but the addition of the diluent can lead to sagging or reduced adhesive force of the paint, and the precoating procedure increases the amount of anti-corrosion construction engineering, so that the corresponding cost is increased, and no quantitative evaluation method is related to the leveling property of the paint.
In general, as the thickness of a dry film of a coating increases, the internal stress of a coating system correspondingly increases, and failure problems such as cracking of the coating are very easy to occur, in view of the problems, the dry film thickness of the coating is required to be not more than 3 times the rated dry film thickness in the national standard GB/T30790 corrosion protection of a colored paint and varnish protective coating system for steel structures, but the requirements are too general, the difference of different coating types is not reflected, and the cracking resistance of the thick film of the coating is not evaluated from a quantized angle.
Chinese patent CN214150732U discloses a device for testing anti-cracking and anti-sagging performance of paint, which comprises a frame body and a drawing plate, wherein the front end and the upper end of the frame body are opened, the height of the frame body from the front end to the rear end is gradually increased, and the drawing plate can be slidably arranged in the frame body along the front-rear direction. The device can be used for brushing the coating with the thickness of 0-5mm gradually, the maximum brushing thickness of the polymer cement coating in the plane construction can be tested in one test, and the test workload can be greatly reduced. The frame body and the drawing plate of the testing device are designed in a split mode, the drawing plate can be manufactured according to the conditions of the field base layer, the actual conditions are more met, and the conditions of the field base layer are conveniently simulated. After the paint is coated on the drawing plate, the drawing plate is taken out, the drawing plate is erected, the thickness of 5mm is lower, the thickness of 0mm is upper, and the sagging condition of the paint can be observed. Generally, a test process needs 1 day, and the drawing plate coated with the paint can be taken out by adopting a split design and put into a new drawing plate again for continuous brushing, so that the efficiency is higher.
The paint is subjected to crack resistance and sagging performance detection by adopting a brushing mode, and the paint has no special structural part of corner part wind and no related edge covering power in the test of a planar coating, so that the technical requirement and the use description of the paint product do not show the sensitivity to thick film cracking at present. In order to facilitate comparative evaluation of edge coverage and thick film crack resistance of different coating types, it is highly desirable to develop an easy-to-implement, highly operable test method.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a paint edge covering force and thick film crack resistance testing device and method, which are used for solving the problems of edge covering force and thick film crack resistance in the prior art, wherein the edge covering force and the thick film crack resistance can be detected at the corner position.
In a first aspect, the invention provides a coating edge covering power and thick film crack resistance testing device, which comprises a tray, wherein the tray is round, a cone is arranged on the tray, the cone is in a shell structure, and the top of the cone is a plane;
be equipped with a plurality of conical surfaces on the cone, a plurality of the area size of conical surface equals, and is adjacent contained angle between the conical surface equals, the conical surface expands from top to bottom, is equipped with the tooth between the adjacent two the conical surface, and a plurality of the tooth height of tooth equals, the tooth is equipped with the flank, the angle of flank and conical surface is alpha, alpha = 90 ~ 150, the tooth is equipped with the flank, the angle beta of flank and flank, beta = alpha-360/tooth number 2, the flank is equipped with the chamfer with the crossing department of flank, the chamfer is 0.5 ~ 3mm.
Preferably, the angle α of each of said flanks to the cone surface is not equal.
Preferably, the material of the testing device is selected from one of carbon steel, low alloy pipe, stainless steel and aluminum alloy.
Preferably, the testing device further comprises a temperature control test box, and the temperature of the temperature control test box is-50-70 ℃.
In a second aspect, the invention claims a paint edge coverage and thick film crack resistance test method comprising the steps of:
s1: polishing and derusting the outer surface of the testing device by adopting sand paper, and removing burrs;
s2: wiping and cleaning the polishing area by using an organic solvent;
s3: blending and filtering the coating to be tested, then spraying the inner surface and the outer surface of the container, enabling the spray gun to be perpendicular to the surface to be sprayed, and controlling the dry film thickness to be a rated dry film thickness value;
s4: curing for 7 days at room temperature after finishing the coating.
Preferably, in step S1, the sandpaper sizes are 60#, 80#, 100# and 120#.
Preferably, in step S2, the organic solvent is selected from one or more of ethanol and acetone.
Preferably, in step S3, the nominal dry film thickness value is 150 μm.
In a third aspect, the invention also claims a coating edge coverage and thick film crack resistance evaluation method comprising an edge coverage evaluation:
dry film thickness measurement is carried out on the plane of the top of the cone and the angle beta position, wherein the beta position is an edge position, the paint edge covering power index is calculated, and the paint edge covering power index is calculated to be more than or equal to 0.8 and is qualified;
paint edge coverage index = edge dry film thickness mean/planar dry film thickness mean.
Preferably, the method further comprises thick film cracking resistance evaluation:
the testing device is processed according to a testing method, and is placed into a temperature control test box after the processing is finished, the temperature of the test box is changed at-30 ℃ to 60 ℃,2 hours are taken as a temperature change cycle, and the total testing time is 252 temperature change cycles;
after the test is finished, the angle alpha position of the tooth side and the conical surface of the testing device and the cracking, foaming and peeling conditions of the coating in other corner areas are observed, and the appearance inspection result is recorded, and can be observed by using a magnifying glass.
Compared with the prior art, the invention has the following beneficial effects:
(1) The testing device is arranged in a cone shape, the top of the cone is in a plane, the leveling property of the paint can be detected by matching with the cone, the angle between the tooth surface and the tooth side is set, the covering force of the corner position of the paint can be calculated by detecting the film thickness of the plane at the top of the cone, the angle between the tooth side and the cone can be used for detecting the corner film thickness cracking property of the paint, the conditions of foaming, peeling and the like under the condition of different angles, the testing device can perform experiments on the edge covering force and the thick film cracking resistance of the paint in an omnibearing manner, and can also detect the leveling property of the paint, and has the advantages of reliable structure, convenient operation, spray coating and brush coating.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a paint edge coverage and thick film crack resistance testing device according to the present invention;
FIG. 2 is a top view of a paint edge coverage and thick film crack resistance testing apparatus in accordance with the present invention;
FIG. 3 is a schematic diagram of a dry film thickness detection part of a paint edge coverage and thick film crack resistance testing device according to the present invention;
FIG. 4 is a graph showing the appearance of cracks in the thick film crack resistance test of the coating of the present invention
In the figure: wherein: 1. a tray; 2. a cone; 2-1, conical surface; 2-2, tooth surface; 2-3, tooth side.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The device for testing the coating edge covering force and the thick film crack resistance comprises a tray 1, wherein the tray 1 is circular, a cone 2 is arranged on the tray 1, the cone 2 is of a shell structure, and the top of the cone 2 is a plane;
the cone 2 is provided with a plurality of conical surfaces 2-1, the areas of the conical surfaces 2-1 are equal, the included angles between the adjacent conical surfaces 2-1 are equal, the conical surfaces 2-1 are expanded from top to bottom, teeth are arranged between the two adjacent conical surfaces 2-1, the tooth heights of the teeth are equal, the teeth are provided with tooth sides 2-3, the angle between the tooth sides 2-3 and the conical surfaces 2-1 is alpha, alpha = 90-150 degrees, the teeth are provided with tooth surfaces 2-2, the angle beta between the tooth surfaces 2-2 and the tooth sides 2-3 is beta, beta = alpha-360 degrees is the number of teeth of a person being 2, the intersection of the tooth surfaces 2-2 and the tooth sides 2-3 is provided with a chamfer, and the chamfer is 0.5-3mm.
In this embodiment, the angle α of each of the flanks 2-3 and the tapered surface 2-1 is not equal.
In this embodiment, the material of the testing device is selected from one of carbon steel, low alloy pipe, stainless steel, and aluminum alloy.
In this embodiment, the test device further includes a temperature control test chamber, where the temperature of the temperature control test chamber is-50 ℃ to 70 ℃.
Example 2
The edge covering power and thick film cracking resistance are tested by adopting an Alord MC-STM-2 modified epoxy paint, and the method is concretely as follows:
the number of teeth of the cone is 8, the angles alpha of adjacent teeth are different by 5 degrees, alpha is 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, beta is 92.5 degrees, 97.5 degrees, 102.5 degrees, 107.5 degrees, 112.5 degrees, 117.5 degrees, 122.5 degrees, 127.5 degrees, chamfer angles are 1mm, the material is carbon steel Q235, the outer surface of the cone is polished by 80# abrasive paper, rust products and oxide skin are removed, the surface is metallic luster, and then an polished area is wiped by acetone. After the surface is clean and dry, the blended modified epoxy paint is sprayed by a spray gun, the dry film thickness is controlled to be about 150 mu m, and after the coating is cured for 7 days, the thickness of the cone angle beta and the top plane area is measured by a film thickness meter.
The results are shown in Table 1 below. The intersection of the angle beta tooth surface 2-2 and the tooth side 2-3 is an edge part, the average value of the dry film thickness of the edge part is shown in the table below, the average value of the dry film thickness of the plane area is 171 mu m, the index of the edge covering power of the paint is 0.81-0.96, the larger the angle beta is, the stronger the edge covering power is, and the paint meets the requirement of the edge covering power.
| Part(s) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Average thickness of |
| Top plane | 170μm | 182μm | 177μm | 179μm | 150μm | 175μm | 164μm | 168μm | 180μm | 171μm |
| Angle beta | 92.5° | 97.5° | 102.5° | 107.5° | 112.5° | 117.5° | 122.5° | 127.5° |
| 1 | 140μm | 138μm | 145μm | 145μm | 152μm | 155μm | 152μm | 160μm |
| 2 | 138μm | 138μm | 132μm | 150μm | 149μm | 151μm | 160μm | 165μm |
| 3 | 132μm | 136μm | 136μm | 148μm | 139μm | 143μm | 143μm | 159μm |
| 4 | 145μm | 144μm | 139μm | 139μm | 152μm | 148μm | 162μm | 169μm |
| 5 | 142μm | 135μm | 141μm | 147μm | 147μm | 151μm | 152μm | 158μm |
| 6 | 136μm | 138μm | 147μm | 142μm | 140μm | 154μm | 149μm | 170μm |
| Average thickness of | 137μm | 137μm | 138μm | 145μm | 147μm | 150μm | 161μm | 164μm |
| Edge covering force | 0.81 | 0.81 | 0.82 | 0.85 | 0.86 | 0.88 | 0.94 | 0.96 |
The test sample to be tested is placed into a temperature control test box, the temperature of the test box is changed at-30 ℃ to 60 ℃, the test box is used as a temperature change cycle, the total test time is 3 weeks (252 temperature change cycles), after the test is finished, the angle alpha and other corner areas of the test device are visually observed, no apparent aging problems such as obvious cracking, foaming, peeling and the like are found, and the coating performance of the paint is good.
Example 3
The edge covering power and thick film cracking resistance are tested by adopting an Alord MC-EI-1 epoxy cloud iron coating, and the method is concretely as follows:
the number of teeth of the cone is 8, the angles alpha of adjacent teeth are different by 5 degrees, alpha is 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, beta is 92.5 degrees, 97.5 degrees, 102.5 degrees, 107.5 degrees, 112.5 degrees, 117.5 degrees, 122.5 degrees, 127.5 degrees, chamfer angles are 1mm, the cone is made of aluminum alloy, 100# sand paper is adopted to polish the outer surface of the cone, rust products and oxide skin are removed, the surface presents metallic luster, and then acetone is used for wiping a polishing area. After the surface is clean and dry, the blended modified epoxy paint is sprayed by a spray gun, the dry film thickness is controlled to be about 150 mu m, and after the coating is cured for 7 days, the thickness of the cone angle beta and the top plane area is measured by a film thickness meter.
The results are shown in Table 1 below. The intersection of the angle beta tooth surface 2-2 and the tooth side 2-3 is an edge part, the average value of the dry film thickness of the edge part is shown in the following table, the average value of the dry film thickness of a plane area is 156 mu m, the index of the edge covering power of the paint is 0.65-0.75, the larger the angle beta is, the stronger the edge covering power is, and the whole paint cannot meet the requirement of the edge covering power.
| Part(s) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Average thickness of |
| Top plane | 147μm | 156μm | 168μm | 144μm | 139μm | 174μm | 143μm | 166μm | 168μm | 156μm |
| Angle beta | 92.5° | 97.5° | 102.5° | 107.5° | 112.5° | 117.5° | 122.5° | 127.5° |
| 1 | 108μm | 102μm | 110μm | 103μm | 109μm | 120μm | 118μm | 121μm |
| 2 | 96μm | 93μm | 106μm | 105μm | 102μm | 115μm | 107μm | 126μm |
| 3 | 94μm | 101μm | 98μm | 104μm | 115μm | 124μm | 112μm | 115μm |
| 4 | 102μm | 110μm | 102μm | 113μm | 107μm | 104μm | 116μm | 111μm |
| 5 | 105μm | 98μm | 104μm | 109μm | 98μm | 111μm | 107μm | 124μm |
| 6 | 93μm | 105μm | 111μm | 104μm | 112μm | 109μm | 104μm | 107μm |
| Average thickness of | 100μm | 102μm | 105μm | 106μm | 107μm | 113μm | 110μm | 117μm |
| Edge covering force | 0.64 | 0.65 | 0.67 | 0.68 | 0.69 | 0.73 | 0.71 | 0.75 |
The test sample to be tested is placed into a temperature control test box, the temperature of the test box is changed at-30 ℃ to 60 ℃, the test box is used as a temperature change cycle, the total test time is 3 weeks (252 temperature change cycles), after the test is finished, the angle alpha and other corner areas of the test device are visually observed, no obvious appearance aging problems such as cracking, foaming, peeling and the like are found, and the coating performance is good.
Example 4
The edge covering power and thick film cracking resistance are tested by adopting an Alord MC-AT-1 aliphatic polyurethane coating, and the specific steps are as follows:
the number of teeth of the cone is 8, the angles alpha of adjacent teeth are different by 5 degrees, alpha is 115 degrees, 120 degrees, 125 degrees, 130 degrees, 135 degrees, 140 degrees, 145 degrees, 150 degrees, beta is 92.5 degrees, 97.5 degrees, 102.5 degrees, 107.5 degrees, 112.5 degrees, 117.5 degrees, 122.5 degrees, 127.5 degrees, chamfer angles are 1mm, the material is carbon steel Q235B, the outer surface of the cone is polished by 80# abrasive paper, rust products and oxide skin are removed, the surface is metallic luster, and then the polished area is wiped by ethanol. After the surface is cleaned and dried, spraying the blended aliphatic polyurethane coating by using a spray gun, controlling the dry film thickness at an angle beta to be about 150 mu m, controlling the dry film thickness at an angle alpha to be 3 times of the rated dry film thickness, namely 450 mu m, curing the coating for 7 days, and measuring the thickness of the edge of the cone angle beta and the top plane area by using a film thickness meter.
The results are shown in Table 1 below. The intersection of the angle beta tooth surface 2-2 and the tooth side 2-3 is an edge part, the average value of the dry film thickness of the edge part is shown in the table below, the average value of the dry film thickness of the plane area is 162 mu m, the index of the edge covering power of the paint is 0.84-0.95, the larger the angle beta is, the stronger the edge covering power is, and the paint meets the requirement of the edge covering power.
| Part(s) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Average thickness of |
| Top plane | 167μm | 176μm | 168μm | 149μm | 139μm | 174μm | 153μm | 166μm | 168μm | 162μm |
| Angle beta | 92.5° | 97.5° | 102.5° | 107.5° | 112.5° | 117.5° | 122.5° | 127.5° |
| 1 | 138μm | 136μm | 131μm | 146μm | 148μm | 156μm | 149μm | 153μm |
| 2 | 145μm | 142μm | 139μm | 142μm | 140μm | 151μm | 147μm | 149μm |
| 3 | 134μm | 140μm | 142μm | 139μm | 148μm | 143μm | 161μm | 159μm |
| 4 | 129μm | 149μm | 141μm | 150μm | 150μm | 145μm | 152μm | 142μm |
| 5 | 135μm | 132μm | 138μm | 132μm | 152μm | 151μm | 159μm | 162μm |
| 6 | 137μm | 128μm | 145μm | 148μm | 139μm | 149μm | 141μm | 157μm |
| Average thickness of | 136μm | 137μm | 139μm | 143μm | 146μm | 149μm | 152μm | 154μm |
| Edge covering force | 0.84 | 0.85 | 0.86 | 0.88 | 0.90 | 0.92 | 0.94 | 0.95 |
And (3) placing the sample to be tested into a temperature control test box, wherein the temperature of the test box is changed at-30-60 ℃, and the test box is used as a temperature change cycle for 2 hours. The total test time was 3 weeks (252 temperature cycles). After the test, the angle alpha and other corner areas of the test device are visually observed, and cracks appear at the position with alpha being 115 degrees, as shown in fig. 4, therefore, when the rated dry film thickness is 3 times, the paint coating can not meet the requirement of the thick film cracking resistance test.
While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and offsets may occur to those skilled in the art to which this disclosure pertains. Such modifications, improvements, and offset processing are suggested in this specification and, therefore, remain within the spirit and scope of the exemplary embodiments of this specification.
It is noted that, if the description, definition, and/or use of a term in an attached material in this specification does not conform to or conflict with what is described in this specification, the description, definition, and/or use of the term in this specification controls.
Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments of this specification. Other variations are possible within the scope of this description. Thus, by way of example, and not limitation, alternative configurations of embodiments of the present specification may be considered as consistent with the teachings of the present specification. Accordingly, the embodiments of the present specification are not limited to the implementations explicitly described and depicted in this specification.
Claims (10)
1. The utility model provides a coating edge covering power and thick film crack resistance testing arrangement, includes tray (1), its characterized in that: the tray (1) is circular, a cone (2) is arranged on the tray (1), the cone (2) is of a shell structure, and the top of the cone (2) is a plane;
the cone (2) is provided with a plurality of conical surfaces (2-1), the areas of the conical surfaces (2-1) are equal in size, the included angles between the adjacent conical surfaces (2-1) are equal, the conical surfaces (2-1) are expanded from top to bottom, teeth are arranged between the adjacent conical surfaces (2-1), the tooth heights of the teeth are equal, the teeth are provided with tooth sides (2-3), the angle between the tooth sides (2-3) and the conical surfaces (2-1) is alpha, alpha = 90-150 degrees, the teeth are provided with tooth surfaces (2-2), the angle beta between the tooth surfaces (2-2) and the tooth sides (2-3), beta = alpha-360 degrees is equal to the tooth number of the teeth of the tooth surfaces (2-2), and the intersection of the tooth surfaces (2-3) is provided with a chamfer, and the chamfer is 0.5-3mm.
2. The paint edge coverage and thick film crack resistance test apparatus of claim 1, wherein: the angle alpha of each tooth flank (2-3) and the conical surface (2-1) is not equal.
3. The paint edge coverage and thick film crack resistance test apparatus of claim 1, wherein: the material of the testing device is selected from one of carbon steel, low alloy pipe, stainless steel and aluminum alloy.
4. The paint edge coverage and thick film crack resistance test apparatus of claim 1, wherein: the testing device also comprises a temperature control test box, wherein the temperature of the temperature control test box is-50-70 ℃.
5. A method of performing paint edge coverage and thick film crack resistance tests using the test apparatus of any one of claims 1 to 4, characterized by: the method comprises the following steps:
s1: polishing and derusting the outer surface of the testing device by adopting sand paper, and removing burrs;
s2: wiping and cleaning the polishing area by using an organic solvent;
s3: blending and filtering the coating to be tested, then spraying the inner surface and the outer surface of the container, enabling the spray gun to be perpendicular to the surface to be sprayed, and controlling the dry film thickness to be a rated dry film thickness value;
s4: curing for 7 days at room temperature after finishing the coating.
6. The method according to claim 5, wherein: in step S1, the specifications of the sand paper are 60#, 80#, 100# and 120#.
7. The method according to claim 5, wherein: in step S2, the organic solvent is one or more selected from ethanol and acetone.
8. The method according to claim 5, wherein: in step S3, the rated dry film thickness value is 150. Mu.m.
9. A method for evaluating paint edge coverage and thick film crack resistance using the test device of any one of claims 1 to 4, characterized in that: including edge covering power assessment:
dry film thickness measurement is carried out on the top plane of the cone (2) and the angle beta position, wherein the beta position is an edge position, the paint edge covering power index is calculated, and the paint edge covering power index is calculated to be more than or equal to 0.8 and is qualified;
paint edge coverage index = edge dry film thickness mean/planar dry film thickness mean.
10. The evaluation method according to claim 9, characterized in that: also included is thick film crack resistance evaluation:
the testing device is processed according to a testing method, and is placed into a temperature control test box after the processing is finished, the temperature of the test box is changed at-30 ℃ to 60 ℃,2 hours are taken as a temperature change cycle, and the total testing time is 252 temperature change cycles;
after the test is finished, the angle alpha position of the tooth side (2-3) and the conical surface (2-1) of the testing device and the coating cracking, foaming and peeling conditions of other corner areas are observed, and the appearance inspection result is recorded, and can be observed by using a magnifying glass.
Priority Applications (1)
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